1 /* audit -- definition of audit_context structure and supporting types
2 *
3 * Copyright 2003-2004 Red Hat, Inc.
4 * Copyright 2005 Hewlett-Packard Development Company, L.P.
5 * Copyright 2005 IBM Corporation
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 */
21
22 #include <linux/fs.h>
23 #include <linux/audit.h>
24 #include <linux/skbuff.h>
25 #include <uapi/linux/mqueue.h>
26
27 /* 0 = no checking
28 1 = put_count checking
29 2 = verbose put_count checking
30 */
31 #define AUDIT_DEBUG 0
32
33 /* AUDIT_NAMES is the number of slots we reserve in the audit_context
34 * for saving names from getname(). If we get more names we will allocate
35 * a name dynamically and also add those to the list anchored by names_list. */
36 #define AUDIT_NAMES 5
37
38 /* At task start time, the audit_state is set in the audit_context using
39 a per-task filter. At syscall entry, the audit_state is augmented by
40 the syscall filter. */
41 enum audit_state {
42 AUDIT_DISABLED, /* Do not create per-task audit_context.
43 * No syscall-specific audit records can
44 * be generated. */
45 AUDIT_BUILD_CONTEXT, /* Create the per-task audit_context,
46 * and fill it in at syscall
47 * entry time. This makes a full
48 * syscall record available if some
49 * other part of the kernel decides it
50 * should be recorded. */
51 AUDIT_RECORD_CONTEXT /* Create the per-task audit_context,
52 * always fill it in at syscall entry
53 * time, and always write out the audit
54 * record at syscall exit time. */
55 };
56
57 /* Rule lists */
58 struct audit_watch;
59 struct audit_tree;
60 struct audit_chunk;
61
62 struct audit_entry {
63 struct list_head list;
64 struct rcu_head rcu;
65 struct audit_krule rule;
66 };
67
68 struct audit_cap_data {
69 kernel_cap_t permitted;
70 kernel_cap_t inheritable;
71 union {
72 unsigned int fE; /* effective bit of file cap */
73 kernel_cap_t effective; /* effective set of process */
74 };
75 };
76
77 /* When fs/namei.c:getname() is called, we store the pointer in name and
78 * we don't let putname() free it (instead we free all of the saved
79 * pointers at syscall exit time).
80 *
81 * Further, in fs/namei.c:path_lookup() we store the inode and device.
82 */
83 struct audit_names {
84 struct list_head list; /* audit_context->names_list */
85
86 struct filename *name;
87 int name_len; /* number of chars to log */
88 bool name_put; /* call __putname()? */
89
90 unsigned long ino;
91 dev_t dev;
92 umode_t mode;
93 kuid_t uid;
94 kgid_t gid;
95 dev_t rdev;
96 u32 osid;
97 struct audit_cap_data fcap;
98 unsigned int fcap_ver;
99 unsigned char type; /* record type */
100 /*
101 * This was an allocated audit_names and not from the array of
102 * names allocated in the task audit context. Thus this name
103 * should be freed on syscall exit.
104 */
105 bool should_free;
106 };
107
108 /* The per-task audit context. */
109 struct audit_context {
110 int dummy; /* must be the first element */
111 int in_syscall; /* 1 if task is in a syscall */
112 enum audit_state state, current_state;
113 unsigned int serial; /* serial number for record */
114 int major; /* syscall number */
115 struct timespec ctime; /* time of syscall entry */
116 unsigned long argv[4]; /* syscall arguments */
117 long return_code;/* syscall return code */
118 u64 prio;
119 int return_valid; /* return code is valid */
120 /*
121 * The names_list is the list of all audit_names collected during this
122 * syscall. The first AUDIT_NAMES entries in the names_list will
123 * actually be from the preallocated_names array for performance
124 * reasons. Except during allocation they should never be referenced
125 * through the preallocated_names array and should only be found/used
126 * by running the names_list.
127 */
128 struct audit_names preallocated_names[AUDIT_NAMES];
129 int name_count; /* total records in names_list */
130 struct list_head names_list; /* struct audit_names->list anchor */
131 char *filterkey; /* key for rule that triggered record */
132 struct path pwd;
133 struct audit_aux_data *aux;
134 struct audit_aux_data *aux_pids;
135 struct sockaddr_storage *sockaddr;
136 size_t sockaddr_len;
137 /* Save things to print about task_struct */
138 pid_t pid, ppid;
139 kuid_t uid, euid, suid, fsuid;
140 kgid_t gid, egid, sgid, fsgid;
141 unsigned long personality;
142 int arch;
143
144 pid_t target_pid;
145 kuid_t target_auid;
146 kuid_t target_uid;
147 unsigned int target_sessionid;
148 u32 target_sid;
149 char target_comm[TASK_COMM_LEN];
150
151 struct audit_tree_refs *trees, *first_trees;
152 struct list_head killed_trees;
153 int tree_count;
154
155 int type;
156 union {
157 struct {
158 int nargs;
159 long args[6];
160 } socketcall;
161 struct {
162 kuid_t uid;
163 kgid_t gid;
164 umode_t mode;
165 u32 osid;
166 int has_perm;
167 uid_t perm_uid;
168 gid_t perm_gid;
169 umode_t perm_mode;
170 unsigned long qbytes;
171 } ipc;
172 struct {
173 mqd_t mqdes;
174 struct mq_attr mqstat;
175 } mq_getsetattr;
176 struct {
177 mqd_t mqdes;
178 int sigev_signo;
179 } mq_notify;
180 struct {
181 mqd_t mqdes;
182 size_t msg_len;
183 unsigned int msg_prio;
184 struct timespec abs_timeout;
185 } mq_sendrecv;
186 struct {
187 int oflag;
188 umode_t mode;
189 struct mq_attr attr;
190 } mq_open;
191 struct {
192 pid_t pid;
193 struct audit_cap_data cap;
194 } capset;
195 struct {
196 int fd;
197 int flags;
198 } mmap;
199 };
200 int fds[2];
201
202 #if AUDIT_DEBUG
203 int put_count;
204 int ino_count;
205 #endif
206 };
207
208 extern int audit_ever_enabled;
209
210 extern void audit_copy_inode(struct audit_names *name,
211 const struct dentry *dentry,
212 const struct inode *inode);
213 extern void audit_log_cap(struct audit_buffer *ab, char *prefix,
214 kernel_cap_t *cap);
215 extern void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name);
216 extern void audit_log_name(struct audit_context *context,
217 struct audit_names *n, struct path *path,
218 int record_num, int *call_panic);
219
220 extern int audit_pid;
221
222 #define AUDIT_INODE_BUCKETS 32
223 extern struct list_head audit_inode_hash[AUDIT_INODE_BUCKETS];
224
audit_hash_ino(u32 ino)225 static inline int audit_hash_ino(u32 ino)
226 {
227 return (ino & (AUDIT_INODE_BUCKETS-1));
228 }
229
230 /* Indicates that audit should log the full pathname. */
231 #define AUDIT_NAME_FULL -1
232
233 extern int audit_match_class(int class, unsigned syscall);
234 extern int audit_comparator(const u32 left, const u32 op, const u32 right);
235 extern int audit_uid_comparator(kuid_t left, u32 op, kuid_t right);
236 extern int audit_gid_comparator(kgid_t left, u32 op, kgid_t right);
237 extern int parent_len(const char *path);
238 extern int audit_compare_dname_path(const char *dname, const char *path, int plen);
239 extern struct sk_buff * audit_make_reply(int pid, int seq, int type,
240 int done, int multi,
241 const void *payload, int size);
242 extern void audit_panic(const char *message);
243
244 struct audit_netlink_list {
245 int pid;
246 struct sk_buff_head q;
247 };
248
249 int audit_send_list(void *);
250
251 extern int selinux_audit_rule_update(void);
252
253 extern struct mutex audit_filter_mutex;
254 extern void audit_free_rule_rcu(struct rcu_head *);
255 extern struct list_head audit_filter_list[];
256
257 extern struct audit_entry *audit_dupe_rule(struct audit_krule *old);
258
259 /* audit watch functions */
260 #ifdef CONFIG_AUDIT_WATCH
261 extern void audit_put_watch(struct audit_watch *watch);
262 extern void audit_get_watch(struct audit_watch *watch);
263 extern int audit_to_watch(struct audit_krule *krule, char *path, int len, u32 op);
264 extern int audit_add_watch(struct audit_krule *krule, struct list_head **list);
265 extern void audit_remove_watch_rule(struct audit_krule *krule);
266 extern char *audit_watch_path(struct audit_watch *watch);
267 extern int audit_watch_compare(struct audit_watch *watch, unsigned long ino, dev_t dev);
268 #else
269 #define audit_put_watch(w) {}
270 #define audit_get_watch(w) {}
271 #define audit_to_watch(k, p, l, o) (-EINVAL)
272 #define audit_add_watch(k, l) (-EINVAL)
273 #define audit_remove_watch_rule(k) BUG()
274 #define audit_watch_path(w) ""
275 #define audit_watch_compare(w, i, d) 0
276
277 #endif /* CONFIG_AUDIT_WATCH */
278
279 #ifdef CONFIG_AUDIT_TREE
280 extern struct audit_chunk *audit_tree_lookup(const struct inode *);
281 extern void audit_put_chunk(struct audit_chunk *);
282 extern int audit_tree_match(struct audit_chunk *, struct audit_tree *);
283 extern int audit_make_tree(struct audit_krule *, char *, u32);
284 extern int audit_add_tree_rule(struct audit_krule *);
285 extern int audit_remove_tree_rule(struct audit_krule *);
286 extern void audit_trim_trees(void);
287 extern int audit_tag_tree(char *old, char *new);
288 extern const char *audit_tree_path(struct audit_tree *);
289 extern void audit_put_tree(struct audit_tree *);
290 extern void audit_kill_trees(struct list_head *);
291 #else
292 #define audit_remove_tree_rule(rule) BUG()
293 #define audit_add_tree_rule(rule) -EINVAL
294 #define audit_make_tree(rule, str, op) -EINVAL
295 #define audit_trim_trees() (void)0
296 #define audit_put_tree(tree) (void)0
297 #define audit_tag_tree(old, new) -EINVAL
298 #define audit_tree_path(rule) "" /* never called */
299 #define audit_kill_trees(list) BUG()
300 #endif
301
302 extern char *audit_unpack_string(void **, size_t *, size_t);
303
304 extern pid_t audit_sig_pid;
305 extern kuid_t audit_sig_uid;
306 extern u32 audit_sig_sid;
307
308 #ifdef CONFIG_AUDITSYSCALL
309 extern int __audit_signal_info(int sig, struct task_struct *t);
audit_signal_info(int sig,struct task_struct * t)310 static inline int audit_signal_info(int sig, struct task_struct *t)
311 {
312 if (unlikely((audit_pid && t->tgid == audit_pid) ||
313 (audit_signals && !audit_dummy_context())))
314 return __audit_signal_info(sig, t);
315 return 0;
316 }
317 extern void audit_filter_inodes(struct task_struct *, struct audit_context *);
318 extern struct list_head *audit_killed_trees(void);
319 #else
320 #define audit_signal_info(s,t) AUDIT_DISABLED
321 #define audit_filter_inodes(t,c) AUDIT_DISABLED
322 #endif
323
324 extern struct mutex audit_cmd_mutex;
325